<template>
  <view class="container">
    <!-- 空白页 -->
    <view v-if="!hasLogin || empty === true" class="empty">
      <image src="/static/emptyCart.jpg" mode="aspectFit"></image>
      <view v-if="hasLogin" class="empty-tips">
        空空如也
        <navigator class="navigator" v-if="hasLogin" url="../index/index" open-type="switchTab">随便逛逛></navigator>
      </view>
      <view v-else class="empty-tips">
        空空如也
        <view class="navigator" @click="navToLogin">去登陆></view>
      </view>
    </view>
    <view v-else>
      <!-- 列表 -->
      <view class="cart-list">
        <block v-for="(item, index) in cartList" :key="item.id">
          <view class="cart-item" :class="{ 'b-b': index !== cartList.length - 1 }">
            <view class="image-wrapper">
              <image :src="item.image" :class="[item.loaded]" mode="aspectFill" lazy-load
                @load="onImageLoad('cartList', index)" @error="onImageError('cartList', index)"></image>
              <view class="yticon icon-xuanzhong2 checkbox" :class="{ checked: item.checked }"
                @click="check('item', index)"></view>
            </view>
            <view class="item-right">
              <text class="clamp title">{{ item.goods_name }}</text>
              <text class="attr">{{ item.sku_name }}</text>
              <text class="price">¥{{ item.price }}</text>
              <uni-number-box class="step" :min="1" :max="item.stock"
                :value="item.num > item.stock ? item.stock : item.num" :isMax="item.num >= item.stock ? true : false"
                :isMin="item.num === 1" :index="index" @eventChange="numberChange"></uni-number-box>
            </view>
            <text class="del-btn yticon icon-fork" @click="deleteCartItem(index)"></text>
          </view>
        </block>
      </view>
      <!-- 底部菜单栏 -->
      <view class="action-section">
        <view class="checkbox">
          <image :src="allChecked ? '/static/selected.png' : '/static/select.png'" mode="aspectFit"
            @click="check('all')"></image>
          <view class="clear-btn" :class="{ show: allChecked }" @click="clearCart">
            清空
          </view>
        </view>
        <view class="total-box">
          <text class="price">¥{{ total }}</text>
          <text class="coupon">
            已优惠
            <text>0</text>
            元
          </text>
        </view>
        <button type="primary" class="no-border confirm-btn" @click="createOrder">
          去结算
        </button>
      </view>
    </view>
  </view>
</template>

<script>
import { mapState } from "vuex";
import uniNumberBox from "@/components/uni-number-box.vue";
export default {
  components: {
    uniNumberBox,
  },
  data() {
    return {
      total: 0, //总价格
      allChecked: false, //全选状态  true|false
      empty: false, //空白页现实  true|false
      hasLogin: false, //空白页现实  true|false
      cartList: [],
    };
  },
  async onShow() {
    this.hasLogin = this.$hasLogin();
    console.log(`this.$hasLogin()`,this.$hasLogin())
    if (this.$hasLogin()) {
      await this.loadData();
    }
  },
  onLoad() { },
  watch: {
    //显示空白页
    cartList(e) {
      let empty = e.length === 0 ? true : false;
      if (this.empty !== empty) {
        this.empty = empty;
      }
    },
  },
  computed: {},
  methods: {
    //请求数据
    async loadData() {
      // let list = await this.$api.json('cartList');
      let { data } = await this.$http.cart.listCart();

      let list = data.list;
      let cartList = list.map((item) => {
        item.checked = true;
        return item;
      });
      this.cartList = cartList;
      this.calcTotal(); //计算总价
    },
    //监听image加载完成
    onImageLoad(key, index) {
      this.$set(this[key][index], "loaded", "loaded");
    },
    //监听image加载失败
    onImageError(key, index) {
      this[key][index].image = "/static/errorImage.jpg";
    },
    navToLogin() {
      uni.navigateTo({
        url: "/pages/public/login",
      });
    },
    //选中状态处理
    check(type, index) {
      if (type === "item") {
        this.cartList[index].checked = !this.cartList[index].checked;
      } else {
        const checked = !this.allChecked;
        const list = this.cartList;
        list.forEach((item) => {
          item.checked = checked;
        });
        this.allChecked = checked;
      }
      this.calcTotal(type);
    },
    //数量
    async numberChange(data) {
      await this.$http.cart.editCart({
        goods_id: this.cartList[data.index].goods_id,
        sku_id: this.cartList[data.index].sku_id,
        sku_name: this.cartList[data.index].sku_name,
        num: data.number,
      });

      this.cartList[data.index].num = data.number;
      this.calcTotal();
    },
    //删除
    deleteCartItem(index) {
      let list = this.cartList;
      let row = list[index];
      uni.showModal({
        content: "确认删除当前商品吗？",
        success: async (e) => {
          if (e.confirm) {
            await this.$http.cart.deleteSku({
              goods_id: row.goods_id,
              sku_id: row.sku_id,
            });

            this.cartList.splice(index, 1);
            this.calcTotal();
            uni.hideLoading();
          }
        },
      });
    },
    //清空
    clearCart() {
      uni.showModal({
        content: "确认清空购物车？",
        success: async (e) => {
          if (e.confirm) {
            await this.$http.cart.clear();
            this.cartList = [];
          }
        },
      });
    },
    //计算总价
    calcTotal() {
      let list = this.cartList;
      if (list.length === 0) {
        this.empty = true;
        return;
      }
      let total = 0;
      let checked = true;
      list.forEach((item) => {
        if (item.checked === true) {
          total += Number(item.price) * item.num;
        } else if (checked === true) {
          checked = false;
        }
      });
      this.allChecked = checked;
      this.total = Number(total.toFixed(2));
    },
    //创建订单
    createOrder() {
      let list = this.cartList;
      let cart_ids = [];
      list.forEach((item) => {
        if (item.checked) {
          cart_ids.push(item.id);
        }
      });
      cart_ids = cart_ids.toString();
      uni.navigateTo({
        url: `/pages/order/createOrder?cart_ids=${cart_ids}`,
      });
    },
  },
};
</script>

<style lang="scss">
.container {
  padding-bottom: 134upx;

  /* 空白页 */
  .empty {
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    height: 100vh;
    padding-bottom: 100upx;
    display: flex;
    justify-content: center;
    flex-direction: column;
    align-items: center;
    background: #fff;

    image {
      width: 240upx;
      height: 160upx;
      margin-bottom: 30upx;
    }

    .empty-tips {
      display: flex;
      font-size: $font-sm + 2upx;
      color: $font-color-disabled;

      .navigator {
        color: $uni-color-primary;
        margin-left: 16upx;
      }
    }
  }
}

/* 购物车列表项 */
.cart-item {
  display: flex;
  position: relative;
  padding: 30upx 40upx;

  .image-wrapper {
    width: 230upx;
    height: 230upx;
    flex-shrink: 0;
    position: relative;

    image {
      border-radius: 8upx;
    }
  }

  .checkbox {
    position: absolute;
    left: -16upx;
    top: -16upx;
    z-index: 8;
    font-size: 44upx;
    line-height: 1;
    padding: 4upx;
    color: $font-color-disabled;
    background: #fff;
    border-radius: 50px;
  }

  .item-right {
    display: flex;
    flex-direction: column;
    flex: 1;
    overflow: hidden;
    position: relative;
    padding-left: 30upx;

    .title,
    .price {
      font-size: $font-base + 2upx;
      color: $font-color-dark;
      height: 40upx;
      line-height: 40upx;
    }

    .attr {
      font-size: $font-sm + 2upx;
      color: $font-color-light;
      height: 50upx;
      line-height: 50upx;
    }

    .price {
      height: 50upx;
      line-height: 50upx;
    }
  }

  .del-btn {
    padding: 4upx 10upx;
    font-size: 34upx;
    height: 50upx;
    color: $font-color-light;
  }
}

/* 底部栏 */
.action-section {
  /* #ifdef H5 */
  margin-bottom: 100upx;
  /* #endif */
  position: fixed;
  left: 30upx;
  bottom: 30upx;
  z-index: 95;
  display: flex;
  align-items: center;
  width: 690upx;
  height: 100upx;
  padding: 0 30upx;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 0 20upx 0 rgba(0, 0, 0, 0.5);
  border-radius: 16upx;

  .checkbox {
    height: 52upx;
    position: relative;

    image {
      width: 52upx;
      height: 100%;
      position: relative;
      z-index: 5;
    }
  }

  .clear-btn {
    position: absolute;
    left: 26upx;
    top: 0;
    z-index: 4;
    width: 0;
    height: 52upx;
    line-height: 52upx;
    padding-left: 38upx;
    font-size: $font-base;
    color: #fff;
    background: $font-color-disabled;
    border-radius: 0 50px 50px 0;
    opacity: 0;
    transition: 0.2s;

    &.show {
      opacity: 1;
      width: 120upx;
    }
  }

  .total-box {
    flex: 1;
    display: flex;
    flex-direction: column;
    text-align: right;
    padding-right: 40upx;

    .price {
      font-size: $font-lg;
      color: $font-color-dark;
    }

    .coupon {
      font-size: $font-sm;
      color: $font-color-light;

      text {
        color: $font-color-dark;
      }
    }
  }

  .confirm-btn {
    padding: 0 38upx;
    margin: 0;
    border-radius: 100px;
    height: 76upx;
    line-height: 76upx;
    font-size: $font-base + 2upx;
    background: $uni-color-primary;
    box-shadow: 1px 2px 5px rgba(217, 60, 93, 0.72);
  }
}

/* 复选框选中状态 */
.action-section .checkbox.checked,
.cart-item .checkbox.checked {
  color: $uni-color-primary;
}
</style>
